Machine foe



WILLIAM o. WRIGHT, or BosToNjMAssA'cHUsETTs.

MACHINE ron DEILLING sToNE.

specincation of Letters Patent No.l 10,618, dated March 7, 1854.

To all whom t may concer/n.'

Be it known that I, WILLIAM C. WRIGHT, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Machines for Drilling Stone; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being made to the accompanying drawings, forming part of this specification, in which Figure l, is a front elevation of a machine constructed according'to my invention. Fig. 2, is a sectional side elevation, and Fig. 3, a back elevation of the same.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists in a certain arrange ment of, and mode of operating two sets of grippers, whereby each set is caused to grip and carry up the drill bar, while the other set slide down the bar previous to renewing their grip, and the drill bar is liberated from both pairs 0f grippers, and let fall at the end of every upward movement. This arrangement allows the drill to strike two blows during every revolutionof the driving shaft, and saves the time lost in raising the bar when only one set of grippers are employed, as one set is always rising, an

also gripping the bar, except short interval when the drill bar falls.

To enable those skilled in the art, to make and use my invention, I will proceed to describe its construction and operation.

A, A, are two wrought iron uprights, which are secured irmly to a base, B, of cast iron or timber, and are stayed by a cross tie, C, near the top. At about the middle of the height of the uprights, are secured the boxes, D, D, which form the bearings of the `horizontal driving shaft, E, which is furnished with cranks, by which rotary motion is given to it. At the top of thekuprights are secured the boxes, F, F, which form the bearings of two short shafts, G, Gr', whichv carry each a sprocket wheel, H, receiving rotary motion through an endless chain, I, from one of two sprocket wheels, J, J, on the driving shaft. The two shafts, Gr, G", stand in line, and are furnished at their adjacent ends, with two cranks, K, K, which stand on diametrically opposite sides of their common axis. The cranksare furnished with wrists, f, f', which enter slotted heads, L, L', at the top of upright rods, M,

during the c the necessary'motion to grip and release the M, whose lower ends are forked to carry the grippers, N, N, which seize the drill bar.

The drilll bar, O, is parallel with-the uprights, A, A, and is placed midwaybetween them, being fitted to work in two guides,`one of which is in the cross tie C, and the other in an arm, P, below. The rods, M, M, which ycarry the grippers, are on opposite sides of,

and nearly close tothe drill bar, andthey work in guides in the cross tie, C, and in the arms, P, and Q, below., The rod, M', `is much longer than theother ,rod,\M, as the grippers must occupy such positions that when the upper set have descended, and the y lower set ascended, simultaneously, 'they will,

clear each other. The nippers are of a form substantially like some of the nippers use for similar purposes, the two aws being hinged together by lugs, a, on opposite sor lsid'esof the drill bar, and each jaw being,

suspended onza horizontal pivot, b, atv the'VL end of one prong of the fork on the rod.

are so formed that their weight makes them grip the drill` bar when they hang free, but

that when the ends areraised they will release the, bar., The holes, "c, c, see Fig. 2, which receivev the pivots, b, of the fork, must benelongated, in orderk to allow the grippers bar. n At the back of the pivot, of the back The jaws are kmade heavy at the ends, and

ser

jaw of each ypair of. nippers, is a shank, d, 1

which passes through one of two slots, e, e', A

in a light upright standard, R, which is se-v cured to the base, B, )behind the drillbar.

The slots, e, e, inthe standard, R, are of .sii'ch length that they will allow the Shanks, ai', of the nppersto move in them as they nippers are raised and lowered by the lrevolution of the wrists ofthe cranks in the slot-s, L L', at`the topof the rods, M, M, but that each shank willstrike kthe top of its slot just before thev grippers arrive at the top of their upward stroke, and arrest its upward movement, after-'which the continuedupward movement of the gripper vrod causes lthe aws of the grippers to be tilted up, and thereby opened to release the rod which during their ascent they have gri Aped and carried up. The slots, ee-, are Iloth straight for the greater portion yof their length, and of aspro er width for the Shanks, fl, ol, to pass easily,1l)1ut they are both curved outward on one side; and thus widened from4 a short distance below the top to the top, andon the opposite side of each is suspended by a pivot, 71 a small arm, g, whose end rests upon a pin, z', .which prevents it falling. The end of this arm is furnished with a hand or angle piece, which, when `the l arm rests on the pin, vz', lays across the slot in the positionfin which the upper one'is represented in Fig. l. As the shank of the grippers arrives opposite the widened part' each of two straight parts, Z, Z, one a little` above the other atA right angles tothe rod, united by a step, m, which is of theform of an arc, described with the radius of the The arc formed step, m, descends crank. from the central po-int'in the slot, and allows the crank wrist after having raised the lrod to the highest position, by passing along the long straight part of the slot, to move in the slot for some distance before commencing to drive it downward; The object of this is to leave the nippers, which have raised the bar, open, after they have released it, for a suiicient time, to allow it to fall. There are stop pieces, S, Si', attached to the front o-f thestandard, R, too-pen `the grippers which have descended, and thus both sets of falls. A

The operation Vof the machine is as follows: I will first suppose the drill bar to have just fallen, after having been raised by the upper set of grippers, N, as represented in Figs. l and '2. The wrist, f, of the crank, K, will be seen in Fig. 2, to be moving` down the arc, m, of the slot in the head, L, of the gripper rod, IVI, consequently the rod is not moving. `Both sets of grippers are open; the upper set in consequence of the shank, d, being depressed by the top of the slot, c, in thefstandard, R, and the lower set, in consequence of the jaws being tilted by the stop, S', on the lower partof the said standard. As the motion of the shafts and cranks continues, the first half of the revolution of the wrist of the crank,

K, will raise the gripper rod, M','and the lower set of grippers, N', and as soon as the said grippers are raised clearof the stop, S', the jaws will fall of their'own weight, and grasp the drill bar, whose friction and weight will draw them tight. In the mean grippers are opened when the `bar- .to .prevent theirgripping the rod, so they slide down easily.v When the shank, ci, `of the grippers, N', reaches the hand of the arm, g, they raise it, and in ascending, this hand turns the drill bar by forcing `the shank toward the widened or recessed part of the slot, e', where it remains until the descent of the grippers. When the shank, d,

reaches the top of the slot, and its upward progress is arrested, the grippers, N', being opened, allow the bar to fall. `The next half revolution of the cranks will cause the wrist of the crank, K, to raise the gripper rod, M, and grippers, N, which will raise the drill bar, while the wrist of the crank, K' after descending the arc, m, of the slot in the head `of the rod, M', will force down the grippers, N Before either pair of grippers are opened, after raising the bar, the pair which have, in the meantime, descended, are also opened bycoming i'ncontact with one of the stops, S, lS', on the standard, R, and these grippers remain `open during the latter part of their downward stroke, and the early` part of their upward stroke; this is necessary for the same reason that `the descent of the nippers which 'have raised the bar, is for a time, arrested,

via-'because if the nippers were not kept open and clear of the bar during its descent, the friction of the bar within them would draw them tight. The continued operation of the machine is vbut a repetition of that described, every revolution of the driving shaft giving two strokesto the drill bar.

What I claim as my invention, and desire to secure by Letters Patent, is:

The combination of mechanism herein described, for operating the drill bar, consisting of' two pairs of grippers, N, N', attached to rods, M, M', having slotted heads, L, L', which receive the wrists, f, 1f', of two cranks, K, K', the said cranks being arranged diametric'ally opposite each other on a common axis, and the slots in the heads of the gripper rods being of such form as described, so as to cause one set of grippers to be always rising while the other pair are descending, but to cause a cessation of motion before every descent, in order `to give pme for the drill bar to fall, as herein set orth.

yWILLIAM C. VRIGHT.

lVitnesses I. K. TYLER, JNO. B. Ro.

ria 

